Objective: You will be able to differentiate between living and nonliving things. Do Now: Read “Maintaining Internal balance” of page 19 Define Homeostasis

Characteristics of living things All living things must perform certain functions to stay alive Non living things do not do all of these What activities can you think of?

Life Functions Nutrition Obtain and breakdown nutrients Cell Respiration Breakdown food to release energy Transport Moving things throughout itself Synthesis Combine simple substances Growth Reproduce Regulation Respond to the environment Excretion Ridding itself of waste Response React to internal or external stimuli

Characteristics of living things All living things share specific characteristics Non living things do not have all of these

Life Characteristics Homeostasis Maintain a stable internal environment Metabolism All of the chemical reactions in the organism Cells All organisms are made up of at least one cell

Objective: You will be able to identify cells using a compound light microscope. Do Now: Read “Made up of cells” on p. 17 How many different cells are found in the human body?

Objective: You will be able to list the levels of organization of life. Do Now: Read “Branches in Biology” on p. 20

Living things and cells All living things are made up of one or more cells Cells are the functional unit of living things Some organisms have only one cell and are called unicellular Some are even made up of trillions of cells

Do you smell what the Rock’s cooking?

Organization levels Biologists break life down into different levels –This makes it easier to study life The order from smallest to largest –Cells, tissues, organs, organ systems and organism

Cells make up living things

Tissues are groups of cells that work together

Organs are made of tissues working together

Organ systems are made of organs that work together

Organism is made of a group of organ systems working together

Objective: You will be able to design a scientific experiment. Do Now: Read “Explaining and Interpreting Evidence” on p. 5 Define Hypothesis

Scientific Experiments State a problem Provide a hypothesis Identify: –Independent variable –Dependent variable Control set up Give a conclusion

Example Problem –Will a plant grow more in saltier water Hypothesis –A lower salt concentration will make the plant grow taller Independent variable is the salt concentration Dependent variable is how tall the plants grow

Pair Work Design an experiment to show which color of light works best for photosynthesis. Go through the steps in the previous slide Each person needs to complete this in their notebook

Objective: You will be able to design a scientific experiment. Do Now: Take the ditto at the back table Answer the questions individually

Now we are going to do a real experiment. Which paper towel absorbs water the best? –Choices: Bounty Brown generic towels White school towels

Towel experiment Take out a new piece of paper. This will count as one of the labs you need to sit for the Regents. Write your name at the top Underneath your name, write the following lab title “Paper Towel Absorbency”

Your Name “Paper Towel Absorbency” Purpose: Materials: